| 摘要 |
A gas-fired heater supplying heat to a space, such as a vehicle cab, and simultaneously, heat to the engine block for running the vehicle. A heat exchanger simultaneously heats a coolant which supplies heat to the engine block, and air to the vehicle cab. The gas-fired heater comprises an inner duct (20) having opposite front and rear ends with a device at its front end for mixing and igniting a mixture of pressurized fuel and a combustion supporting gas that is discharged through an exhaust conduit (22) from its rear end to an exhaust outlet (21) located adjacent to its front end; an intermediate duct (210) circumscribing the rear portion of the inner duct wherein the space between the inner and intermediate ducts receives a fluid to be heated; an outer duct (30) surrounds the inner and intermediate duct. |
